If 1 lb. of a certain substance will purify 200 cubic
feet of normal crude acetylene, that weight is sufficient to treat the
gas evolved from 40 lb. of carbide; but it will only do so provided it is
so disposed in the purifier that the gas does not pass through it at too
high a speed, and that it is capable of complete exhaustion. In the coal-
gas industry it is usually assumed that four layers of purifying
material, each having a superficial area of 1 square foot, are the
minimum necessary for the treatment of 100 cubic feet of gas per hour,
irrespective of the nature of the purifying material and of the impurity
it is intended to extract. If there is any sound basis for this
generalization, it should apply equally to the purification of acetylene,
because there is no particular reason to imagine that the removal of
phosphine by a proper substance should occur at an appreciably different
speed from the removal of carbon dioxide, sulphuretted hydrogen, and
carbon bisulphide by lime, ferric oxide, and sulphided lime respectively,
Using the coal gas figures, then, for every 10 cubic feet of acetylene
generated per hour, a superficial area of (4 x 144 / 10) 57.
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